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v/tools/fast/fast.v

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// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
import os
import time
fn main() {
exe := os.executable()
dir := os.dir(exe)
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vdir := os.dir(os.dir(dir))
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if !os.file_exists('$vdir/v') && !os.dir_exists('$vdir/vlib') {
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println('fast.html generator needs to be located in `v/tools/fast/`')
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}
println('fast.html generator\n')
// Fetch the last commit's hash
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println('Fetching updates...')
exec('git pull --rebase')
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mut commit_hash := exec('git rev-parse HEAD')
commit_hash = commit_hash[..7]
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if !os.file_exists('table.html') {
os.create('table.html') or { panic(err) }
}
mut table := os.read_file('table.html') or { panic(err) }
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// Do nothing if it's already been processed.
if table.contains(commit_hash) {
println('Commit $commit_hash has already been processed')
return
}
// Build an optimized V
println('Building vprod...')
exec('v -o $vdir/vprod -prod $vdir/v.v')
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println('Measuring...')
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diff1 := measure('$vdir/vprod -cc clang -o v.c $vdir/v.v')
diff2 := measure('$vdir/vprod -cc clang -o v2 $vdir/v.v')
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diff3 := measure('$vdir/vprod -o v2 -fast $vdir/v.v')
diff4 := measure('$vdir/vprod -cc clang $vdir/examples/hello_world.v')
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//println('Building V took ${diff}ms')
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commit_date := exec('git log -n1 --pretty="format:%at"')
message := exec('git log -n1 --pretty="format:%s"')
date := time.unix(commit_date.int())
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mut out := os.create('table.html') or { panic(err) }
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// Place the new row on top
table =
'<tr>
<td>${date.format()}</td>
<td><a target=_blank href="https://github.com/vlang/v/commit/$commit_hash">$commit_hash</a></td>
<td>$message</td>
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<td>${diff1}ms</td>
<td>${diff2}ms</td>
<td>${diff3}ms</td>
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<td>${diff4}ms</td>
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</tr>\n' +
table.trim_space()
out.writeln(table)
out.close()
// Regenerate index.html
header := os.read_file('header.html') or { panic(err) }
footer := os.read_file('footer.html') or { panic(err) }
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mut res := os.create('index.html') or { panic(err) }
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res.writeln(header)
res.writeln(table)
res.writeln(footer)
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res.close()
}
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fn exec(s string) string {
e := os.exec(s) or { panic(err) }
return e.output
}
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// returns milliseconds
fn measure(cmd string) int {
println('Warming up...')
for i in 0..3 {
exec(cmd)
}
println('Building...')
ticks := time.ticks()
exec(cmd)
return int(time.ticks() - ticks)
}